The effect of inclusions of aluminum oxide on the processes of hydrogen dissolution and evolution in aluminum and copper melts

Пикунов, М. В.; Gerasimov, S. P.; Yudin, V. A.

doi:10.3103/s1067821209030055

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“…Anyalebechi analyzed hydrogen solubility in liquid Al-H and Al-H-X (where X = Cu, Si, Zn, Fe, Mg, Ti, or Li) alloys via Wagner’s interaction parameter [ 16 ], finding that isothermal hydrogen solubility in liquid Al alloys at 101.3 kPa hydrogen partial pressure decreases with an increase of Cu, Si, Zn and Fe levels, but increases with the addition and increase of Mg, Li, and Ti; meanwhile, he found that hydrogen solubility increases with increasing temperature. M. V. Pikunov investigated the effect of the inclusion of aluminum oxide on the processes of hydrogen dissolution and evolution in molten aluminum and copper experimentally [ 17 ]; his work explained the relationship between the contamination of molten aluminums by oxide inclusion and porosity of cast billets caused by the evolution of hydrogen bubbles.…”

Section: Introductionmentioning

confidence: 99%

First Principles Study of Adsorption of Hydrogen on Typical Alloying Elements and Inclusions in Molten 2219 Al Alloy

et al. 2017

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To better understand the effect of the components of molten 2219 Al alloy on the hydrogen content dissolved in it, the H adsorption on various positions of alloying element clusters of Cu, Mn and Al, as well as the inclusion of Al2O3, MgO and Al4C3, were investigated by means of first principles calculation, and the thermodynamic stability of H adsorbed on each possible site was also studied on the basis of formation energy. Results show that the interaction between Al, MgO, Al4C3 and H atoms is mainly repulsive and energetically unfavorable; a favorable interaction between Cu, Mn, Al2O3 and H atoms was determined, with H being more likely to be adsorbed on the top of the third atomic layer of Cu(111), the second atomic layer of Mn(111), and the O atom in the third atomic layer of Al2O3, compared with other sites. It was found that alloying elements Cu and Mn and including Al2O3 may increase the hydrogen adsorption in the molten 2219 Al alloy with Al2O3 being the most sensitive component in this regard.

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Section: Introductionmentioning

confidence: 99%